vendor/doctrine/doctrine-cache-bundle/DependencyInjection/Configuration.php

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<?php
/*
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
 * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 *
 * This software consists of voluntary contributions made by many individuals
 * and is licensed under the MIT license. For more information, see
 * <http://www.doctrine-project.org>.
 */

namespace Doctrine\Bundle\DoctrineCacheBundle\DependencyInjection;

use Symfony\Component\Config\Definition\Builder\TreeBuilder;
use Symfony\Component\Config\Definition\ConfigurationInterface;
use Symfony\Component\Config\Definition\NodeInterface;

/**
 * Cache Bundle Configuration
 *
 * @author Guilherme Blanco <guilhermeblanco@hotmail.com>
 * @author Fabio B. Silva <fabio.bat.silva@gmail.com>
 */
class Configuration implements ConfigurationInterface
{
    /**
     * @param array $parameters
     *
     * @return string
     */
    public function getProviderParameters(array $parameters)
    {
        if (isset($parameters['type'])) {
            unset($parameters['type']);
        }

        if (isset($parameters['aliases'])) {
            unset($parameters['aliases']);
        }

        if (isset($parameters['namespace'])) {
            unset($parameters['namespace']);
        }

        return $parameters;
    }

    /**
     * @param array $parameters
     *
     * @return string
     */